SWDEV-510849 - Restore pinned memory copy path

1) Create getBuffer method to return pinned host memory or staging buffer
2) for D2H path use managed buffer instead of static buffer
3) use staging buffer copy for 16KB < size < 1MB
4) use pinned memory copy for size > 1MB

Change-Id: I13d4d6ab60691bc6c7724239db1e11e23f0f3dc2


[ROCm/clr commit: 4bf634dfca]

projects/clr/rocclr/device/rocm/rocsettings.cpp

@@ -117,7 +117,6 @@ bool Settings::create(bool fullProfile, const amd::Isa& isa,
     apuSystem_ = true;
   } else {
     pinnedXferSize_ = std::max(pinnedXferSize_, pinnedMinXferSize_);
-    stagedXferSize_ = std::max(stagedXferSize_, pinnedMinXferSize_ + 4 * Ki);
   }
   enableXNACK_ = enableXNACK;
   hsailExplicitXnack_ = enableXNACK;
@@ -209,10 +208,6 @@ void Settings::override() {
     xferBufSize_ = GPU_XFER_BUFFER_SIZE * Ki;
   }
 
-  if (!flagIsDefault(GPU_PINNED_MIN_XFER_SIZE)) {
-    pinnedMinXferSize_ = std::min(GPU_PINNED_MIN_XFER_SIZE * Ki, pinnedXferSize_);
-  }
-
   if (!flagIsDefault(AMD_GPU_FORCE_SINGLE_FP_DENORM)) {
     switch (AMD_GPU_FORCE_SINGLE_FP_DENORM) {
       case 0: